Transcript Adding and Subtracting Rational Numbers

COURSE 3 LESSON 4-4
Adding and Subtracting Rational Numbers
Find 6 3 + 8 2 .
4
3
Method 1 Use improper fractions.
3
2
27
26
81
104
64 +83 = 4 + 3
= 12 + 12
185
= 12
5
= 15 12
Write each mixed number as an
improper fraction.
Write equivalent fractions using the LCD, 12.
Add the numerators.
Change the improper fraction to a
mixed number.
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COURSE 3 LESSON 4-4
Adding and Subtracting Rational Numbers
(continued)
Method 2 Rewrite the mixed numbers using common denominators.
3
2
9
8
6 4 + 8 3 = 6 12 + 8 12
17
Rewrite each mixed number using
the LCD, 12.
= 14 + 12
Add the integers and the fractions.
5
Change the improper fraction to a
mixed number.
= 14 + 1 12
5
= 15 12
Add the integers.
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